I have no particular aversion to the Kobo ebook store, but apart from an initial single purchase to see how it worked I don't generally buy books from Kobo for several reasons;
I have a couple of other tablets which I like better, although they do have Kobo reader s/w on them which I could use, I suppose.
I get my books mainly from public libraries because they're free.
If I did decide to buy an ebook, I would check out the prices on Amazon and Google's bookstore as well. (But I would start with the latter to first use up the $25 credit that came with my Nexus 7)